- 2023
- Sep
- 29
Did Espressif fix their RF spurs?
Some time ago, I wrote about my experiences with the ESP8266 line of microcontrollers. Specifically, that they had a giant RF spur at 319.98MHz. This wasn’t an unknown issue, the FCC documentation (had I read it beforehand) clearly called that out. See this post: https://wereboar.com … of-cheap-technology/ for more info on that.
Recently, I picked up this little gadget from a well-known overseas marketer. It works amazingly well, although I suspect this one of having hacked firmware… The MAC it gives to the router clearly identifies it as an Espressif device.
One of the things I immediately noticed, however, was that there isn’t a spur. I was running my devices in a similar manner, they were simply consuming data while being connected to a WiFi interface. I have to wonder if Espressif has fixed that issue, or if the firmware is doing something odd to keep that in check. More investigation is needed here, and perhaps a new look at my old designs is in order.